Engine



vC. W. DAKE ENGINE Original Filed Deo. 5, 1930 3 Sheets-Sheet 1 Il!! Il.

ATTORNEYS Oct 6, 1936. c. wIDAKE 2,056,567

ENGINE Original Filed De. 5, 1930 3 Sheets-Sheet 2 l I 5 U/ I I U .l

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ATTORNEYS @cn 6,1936. C. w. BAKE 2,056,567

' ENGINE Original Filed Dec. 5, 1930 3 Sheets-Sheet 5 INVENTOR PatentedOct. 6, 1.936

UNITED STATES PATENT orgies Refiled for abandoned application Serial No.

500,310, December 5, 1930.

This application October 21, 1935, Serial No. 46,035

6 Claims.

My invention relates to improvements in engines and has for one objectto provide a new and improved means associated preferably with theengine piston adapted'when the connecting rod and crank are on deadcenter to apply a rotary force on the crank pin to overcome a deadcenter effect. Other objects will appear from time to time throughoutthe specication and claims.

My invention is illustrated more or less diagrammatically in theaccompanying drawings, wherein- Figure 1 is a section showing the engineat dead center;

Figure 2 is a section showing the engine after the crank has progresseddegrees from dead center;

Figure 3 is a detail section showing the positions for a 270 degree ofthe crank from dead center;

Figure 4 is a plan View of the piston;

Figure 5 is a section showing a modied form on dead center;

Figure 6 is a side elevation of the piston.

Like parts are indicated by like characters throughout the specicationand drawings.

A is the engine cylinder, A-l the cylinder head. A-Z is the combustionchamber, A3 the spark plug. A-l is a valve. A-li is a gas passagecontrolled by the valve A-4 and A- is a valve tappet controlling themovement of the valve.

B is a piston reciprocating in the cylinder A, having a wrist pin B-l, aconnecting rod B-2 pivoted thereon, the big end B-S of the connectingrod B-2 rotating on the crank pin B-4 on the crank B-5 of the crankshaft B--6.

Integral with the connecting rod B-2 is a lever C extending generally atright angles to the axis of the connecting rod. C-I is a sub pistonslidable in the main piston B. It has a wrist pin C-Z and a connectingrod C-3 pivoted at one end on the wrist pin, at the other end on thetoggle pin C-4 on the lever C.

Starting with the parts in the position shown in Figure 1, pressure inthe combustion chamber A-2 tends of course to move the piston B down butuntil the crank has got beyond dead center, this pressure is resisted bythe aligned crank and connecting rods. If the piston is on dead centerwhen the pressure is applied the engine will not start. However, part ofthis pressure is applied to the sub piston C-L That sub piston tends tomove downwardly with respect to the piston B and in its movement torotate the lever C in a counterclockwise direction. This tends to rotatethe connecting rod about the wrist pin B--l in a countedclockwisedirection and so exerts a pressure on the crankrpin toward the righttending to cause the crank to rotate in a clockwise direct'ion,'thus thepresence of the sub piston provides means for throwing the crank off thedead center position. The movement of the sub piston with respect to themain piston as shown in Figures 2 and 3 is comparatively slight. Thecross sectional area of the sub piston in relation to the main piston iscomparatively small and the change in l0 the size of the piston or gaschamber is therefore negligible and does not aiiect adversely thepressure conditions in the cylinder during the operating cycle.

In the modified form shown in Figure 5, inl5 stead of having a subpiston inside the main piston, I provide the main piston D and surroundit by an annular sub piston D-l, the lever D-Z on the connecting rodhaving a ball end D-3 engaging a hardened ring D-l in the skirt of the20 sub piston. Under these circumstances, of course, the sub pistontends to go down under pressure exerting the same kind of pressure onthe lever to throw the connecting rod 01T dead center.

I have shown my invention as applied to an internal combustion engine.Obviously, it might equally well be applied to a steam engine and anymeans for providing fluid pressure to it, hydraulic, gas, steam or burntgas whereby pressure tends to move the piston, falls within the terms 30of my invention.

This application is a rei-lle oi my abandoned application No. 500,310,filed Dec. 5, 1930.

I claim:

1. In an internal combustion engine having a 35 cylinder, a piston, acrank, a connecting rod interposed directly between the piston and thecrank, a lever rigidly connected to the connecting rod, a sub pistonslidable in the main piston having its longitudinal axis eccentric tothe longitudinal axis of the main piston and connecting rod interposedbetween the sub piston and the end of the lever.

2. In an internal combustion engine having a cylinder, a piston, acrank, a connecting rod interposed directly between the piston and thecrank, a lever rigidly connected to the connecting rod, a sub pistonslidable in the main piston having its longitudinal axis eccentric tothe longitudinal axis of the main piston and connecting rod interposedbetween the sub piston and the end of the lever, the sub piston beingadapted to have its working head substantially in the same plane as theworking head of the main piston when the crank is at dead center. 55

3. In an internal combustion engine having a cylinder, a piston and acrank, a connecting rod interposed directly between the piston and thecrank, a lever rigidly connected to the connecting rod, a sub pistonsldable in the main piston and adapted to have its Working headsubstantially in the same plane as the working head of the main pistonwhen the crank is at dead center.

4. In an internal combustion engine having a cylinder, a piston, acrank, a connecting rod interposed directly between the piston andcrank, the cylinder having a combustion chamber bounded at one side bythe piston, engine valves independent of the piston adapted to controloW of gas to and from the piston chamber, a sub piston mounted in themain piston, a lever arm rigidly associated with the main connectingrod, a sub connecting rod interposed between the lever arm and the subpiston, the relation of connecting rods, pistons and lever arm beingsuch that when the crank is at dead center, the heads of both pistonsare in substantially the same plane.

5. In an internal combustion engine having a cylinder, a piston, acrank, a connecting rod interposed directly between the piston and thecrank, a lever rigidly connected to the connecting rod, a sub pistonsldable in the main piston having its longitudinal axis eccentric to the1ongitudinal axis of the main piston and connecting rod interposedbetween the sub piston and the end of the lever, the sub piston beingadapted to have its Working head in substantially the same plane as theWorking head of the main piston when the crank is at dead center, thesub and main pistons having plane heads perpendicular to the axis of thecylinder.

6. In an internal combustion engine having a cylinder, a piston, acrank, a connecting rod interposed directly between the piston and thecrank, a lever rigidly connected to the connecting rod, a sub pistonVsldable in the main piston and adapted to have its working head insubstantially the same plane as the working head of the main piston whenthe crank is at dead center, the sub and main pistons having plane headsperpendicular to the axis of the cylinder.

CHARLES W. DAKE.

